Ring of Invincibility

Valador's Ring of Invincibility is an artifact in Heretic. While wearing a Ring of Invincibility, the player is immune to all attacks and has gold-tinted vision. The effect lasts 30 seconds.

The invulnerability colormap bug can be seen while using this artifact in vanilla Heretic.

This item is included in the items percentage displayed at the end of each level.

Appearance statistics
In the IWADs the ring of invincibility is first encountered on these maps per skill level:

The IWADs contain the following numbers of rings of invincibility per skill level:

Other games
Hexen and Hexen II have a similar item, the Icon of the Defender, but its effect is slightly different depending on the player's character class.